This Spanish proverb about procrastination reminds us that it's easy to put things off until tomorrow, but that will just mean having to catch up on everything the next day - with added stress and less time to boot.
All those things we put off for the next day or don't properly schedule add up. As we've mentioned in a previous quotable, to actually be productive you've got to stop trusting your future self to get stuff done; do it now. Our future selves are unreliable and our tomorrow tasks are filling up fast.
This "tomorrow is often the busiest day of the week" proverb has also been said as "tomorrow is often the busiest day of the year," so you can choose whichever suits you best as a reminder to get whatever you can done today.